Manga effect. One side glass coating?
Expanding on the first point of John's answer.


  For realtime or viewport effects like this the general idea is to duplicate the mesh, then change that mesh to complete black then slightly upscale it so it covers your base mesh, as well as flipping all the normals on the black mesh and turning on 'Backface Culling' in the viewport settings.



&#8679; ShiftD to duplicate.
Enter Edit Mode &#8633; Tab, select all A, flip normals &#9096; CtrlF > Flip Normals.
Fatten the mesh slightly, &#9095; AltS.
Exit edit mode and assign a new black Material.
Turning off double sided faces in Blender: Go to the Shading Panel and check Backface Culling.